Geomagnetic Sq Var iat ions and Parameters of the Indian Electro jet for 1958,1959 .\ " Y.\ I "' ) 1l nn.l K. a KIL\XX .\ (' ,J!<I}JfI HOIIII.JI. ,y t Rt rr; !"Hl I fJ /) 1'( " .' ''' &. '' lf if;2) A n ,";'!'H.\ CT . - 'I .u Trivan. Irum ••\ n n a m a l.l il la C-'lr lh..th d",.... to li lt, tuuznetic oqua t.. !) und . \!illa :! .Ir, - cx.uuin-«! I" , tlx- di ffcrem ,..l"il "" II " for t ill' .\"t'an_ )!I,i ..; 11111 1 l!t:,!I. T Ilf' ra n jZ('''' in IJ f" r t ill' "h"' ,·r\·at"ri .... d, ' ..... . 1, , 1 til' 1II.1l!lld ir ' ·( \ ' l.I l " r nn- .... u-iu•• 1 H'ry 11I r gl'. :'Ila x illl u lll r :t IlL. .. .,. in JI nud Z .x-cur ill r!l'·" 'l uill' ''I:tilll ltl''" l h.. ,dlil.- ma xi unuu 1";111/.: .. in /' '' ('("lIr ", d ur iu!! t it.. sunnmr. 0 11 11' 1 d lOl r<l e h' ri"t ip,. " I till' v.ma t j, 'Ih ;H.' pOlilJ l,·,1"111. t h.' '"'''' 11.,1 '' 11 - Ha l lin 'uf -. (7.) at Tri vandr um a llll .\ lIIuli lla l;. i,lll ga r. l' ."illj.! till ' IIl llll:lI it llf]p" .. f ."" ( 1/) at Il l" tim'" ..h,.,. ·n 'al ..ri.... fur till' p' t' ri ocl Apr il to .\ UA" Il"t (a I " ' r-i o d duri tli: wh ich t li.· ... ,Ia r ll,u'll-z"nit!l ;1111.:1, . \'.Iri, ·" ,hl""ul!h 1I 1"llIt :!ll" 1" 11" all t hr- thn-c l,hlw n ·;\t" ri,.,,). !'s li llml " ,,; of ti ll' p;lr, 1I1 1 "kr" 01 t ill' Il ulillll t-J,·('j I'..jd ur.. mnrh-. Tlw h.df-widt h (Of t hc pJ('d rnjd is found In I", 1iI',lf l," :\1l0 k ill. Th e t"t ;t1 " UITl'llt s, n' Ill!l h ill I Ill' ,·I'·Pl l"lOj, ·t is 1I1"1l1t US. tk m o r- Hi .O IM I .-\,d q.rn 'p luti t urh-. Th... lild ur hy whu-h tla- 110rl1lal .\ curn.nt sl n' ll;!th is intl'n"jjj,'d l\! tilt' lIlal!lwti.. equa tor ill fu uud t .. bn :?-I . 1. Introduction 1.1. Gl'omngnt'l it S" yariatiolls at 'l'ri- vundr um awl . .. itu at(',1 'war t hr ma gu et ic cq uutor, h:n:r 111 'r ll «xuruiuod 11 \' Y:w oll n.1H 1 Y a.r ol l aw l Pi:.;)tarot \. unrl shown to 1)\· Jar !;" (:01l I /l:U '4'11 with va rint ions a1 .:\Iiha!.! , H"rl' t lu- lIlliet -da \- vuri urions ill t lw different magne tic e lt' 1Il4' n t's ure st udi l'll for the years HI:jK awl IH;jU to out t he :o; ea:-: ollal eharad t'l'i, .. t or t lU' variation. ... , From the magni tude,.. of t ln- "" '1 (II) vutia t iun s un ut tvinpr is IlIatll' t il (. :o; tim ;tt p the width . t he peak current intl'll :-: it'·;lJl(I I lit· re lut ive 1l H' :1 11 iOllosplH'ri{' (·flwillct·j\·it it. .... of tlu- d ny-t inn- eq uat or ia l f·! <,<,· trojl·t for th e period under st ud v. I ,:!. The dutu 1I Sf'.1 ure frnm t lu- m3l!ueti(' observutor ios at Tri\' antlrnm . An namul ui- nagar an.1 .:\ Iih.\ ,!! , T hr l·o-onlin: ltt·s of tht.'M' oh:-:erva.torit·:o' awl .--0 1111..' of the rdt " 'ant Illag' netie paranll't er :o; at tlw-:,e [\rI ' giycn in Ta 1111' I. 2. , .,.'/ Vall.l1lons :! . 1. Tht' IJIf'an Sq ,·ariOltiolL'" for the difft.•. ft'nt fo r the If . Datlll Z are !ihOWfl in Fi g-s, 1 aud :? The fju il'l - (lay range s for t he t hree oh:-'t· rva tori.,s nr-- g in'a in Tuhl .. :!. :! . :1 , TIH' fol lowing arc some of t ilt' striking r4'at m'I'S regnu ling SIJ variat ions 11.1. t hese obscrvnto ties - (a) TIll' rang":-; in 8 1/ ( If) are very largt . at t lu- ol l:-:p l'\'n.tllrip :-:, {'ltlSl' to the nmguetio f'41'I,\ t Or. l't': .. T r ivc ud ru m a nd Ann uumln i- nagar ( 'ompart',1 to the rangt' at Alil Jl! g, (II) For all t he observator ies t ill' ra ngt·s in '" ( II ) :lI HI S'I (Z) urc maxim um Iluring- t lu- , . 1 cquiuoct ial months hut 1he ra ng4' III 8'1 ( J) i:-: maxim um (luring the summer mon ths. (c) Th4' in mngf' for nil t he ele- mont s from t hc cquinoct ial mont hs to :-: U1H III 4 'r months is upprcoiable for Trivan- drum anr] .\ nnamalainagar hUI, not so fur lilt' olls('n ·:l.tory, AJiJ ); \,!! , (d ) S , ( II ) '"nriation,,'t a ll the three ,,11,,·,. · \'ator i..s are pral'ti( 'ally in plaa ,, "I' in all Iht· rhr 4'4 ' the m axima OC' currinf! within a f(·w lIlinutes of e. \ch o tht'l', Ther e a. clt'ar tentlellcv for maximum Sq( Il ) to occur r arli er h\ ah01;t an hour in the equinoc tial mon th..... , at Trh-aIHlrlllll allll Allna ma la i· lIa g-a r.
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Geomagnetic Sq Variation s and Parameters of the
Indian Electrojet for 1958,1959
.\ " Y.\ I "') 1l nn.l K. a KIL\XX.\
( ',J!<I}JfI ()h~f'rt'at u':J . HOIIII.JI. ,y
tRt rr; !"Hl I fJ /)1'(" .' ''' &.' ' lfif;2)
A n,";'!'H.\ CT. t _ ; t " ' lll.1. ~"· l i (' -'I '-;t1 l.H i"ll~ .u Trivan. Irum• •\ n n a ma l.l il la C-' lr lh..th d",.... t o li lt,tuuzne ti c oqua t.. ! ) und .\!illa:! .Ir, - cx .uuin-«! I" , tlx- di ffcrem ,..l"il "" II " for t ill' .\"t'an_ )!I,i ..; 111111 l!t:,!I. T Ilf'ra n jZ('''' in IJ f" r t ill' "h"' ,·r\·at"ri.... d, ' ..... . 1, , 1 til ' 1II.1l!lld ir ' ·( \ ' l.I l " r nn- .... u-iu•• 1 H 'ry 11I r gl'. :'Ila x illlu lll r :t IlL... .,.
in JI nud Z .x-cur ill r!l'·" 'l uill' ''I: ti lll ltl''" l h.. ,dlil. - ma xi unuu 1";111/.:.. in / ' ''('("lIr ", d ur iu!! t it.. sunnmr. 0 1111'1d lOl r<leh' ri"t ip,. " I t ill' v.ma t j, 'Ih ;H. ' pOlilJ l, ·,1 "111. " " I " Till ll ~' t h.' '" ' '' ' 11.,1' '11 - Ha l lin' u f - . (7.) at Tr ivandr uma llll . \ lIIulilla l;. i,lll ga r.
l'."i llj.! till ' IIl l l ll:lI i t llf]p" .. f ."" ( 1/) a t I l l" t im '" .. h,.,. ·n 'al .. ri.... fur till' p't' riocl April to . \ UA"Il " t (a I " ' r-iod
duri tli: wh ich t li.· .... ,Ia r ll, u'll-z" n it !l ;1111.:1, . \'.Iri, ·" , hl""ul!h 1I 1"llIt :!ll" 1" 11" all t hr- thn-c l,hlw n ·;\t" ri,.,,).!'s li llml " ,,; of ti ll' p;lr,1I11"kr" 01 t ill' Il ulillll t -J, ·('j I'.. jd ur.. mn rh-. Tl w h.df-widt h (Of t hc pJ('d rnjd is foundIn I", 1iI' ,lf l," :\1l0 k ill. Th e t"t ;t1 " UITl'llt s, n' Ill!l h ill I Ill' , ·I'·Pl l"lOj, ·t is 1I1"1l1t U S .tkm o r- Hi.OIM I .-\ ,d q.rn 'pluti t urh-. Th... lild ur hy whu-h tla- 110r l1lal .\ curn.nt sl n' ll;!t h is intl'n "jjj,'d l\! t ilt' lIlal!lwti.. equat o r illfuuud t .. bn :?-I .
1. Introduction
1 . 1. Gl'omngnt' l it S" ya ria t iolls at 'l' rivundrum aw l ~\ II I Ul.l l la l ai na.l!a r . ...ituat(',1 'wart hr ma guet ic cq uutor, h:n:r 111 'r ll «xuruiuod11 \' Y :w oll ( I ~);)n) n.1H1 Y a.r ol l awl P i:.;)tarot \.(i~)('i :!) unrl shown to 1)\· Jar !;" (:01l I /l:U '4'11 withva rint ions a1 .:\Iiha!.!, H" rl' t lu- lIlliet -da \vuriurions ill t lw different magnetic e lt'1Il4'n t'sure st udi l'll for the years HI:jK aw l IH;jU tohrill~ out t he :o;ea:-:ollal eha rad t'l'i,..t i ('~ or t lU'variation.... , From the magni tude,.. of t ln- ""'1( II ) vutia t iuns un ut tvinpr is IlIatll' t il (.:o; tim ;ttpthe width. t he peak current intl'll :-: it'·;lJl(I I lit·re lut ive 1lH':1 11 iOllosplH'ri{' (·flwillct·j\·it it..... oftlu- dny-t inn- eq uat or ia l f·!<,<,· t rojl·t for th eperiod under st ud v.
I ,:!. The dutu 1ISf'.1 ure frnm t lu- m3l!ueti('observutorios at Tri\'antlrnm. An namuluinagar an.1 .:\ Iih.\,!!, T hr l·o-onlin:ltt·s of t ht.'M'oh:-:erva.torit·:o' a w l .--0 1111..' of the rdt" 'ant Illag 'netie paranll't er:o; at tlw-:,e oh~t'n'ato ri , ':o; [\rI '
giycn in Ta1111' I.2. ,.,.'/ Val l.l1lons
:! . 1. Tht' IJIf'an Sq ,·ariOltiolL'" for the difft.•.f t'nt :;;('a ,;~ons fo r the (' It·m(-, Ilt~ If. Datlll Z a re!ihOWfl in F ig-s, 1 aud :? The ~ I 'a:o;ofla l fju il'l -
(lay ranges for t he t hree oh:-'t·rvator i.,s nr-gin'a in Tuhl .. :!.
:! . :1 , TIH' fol lowing arc some of t ilt' st rikingr4'at m'I'S regnuling SIJ variat ions 11.1. t heseobscrvntoties -
(a) TIll' rang":-; in 8 1/ (If) are very largt . att lu- oll:-:p l'\'n.tllrip:-:, {'ltlSl' to the nmguetiof'41'I,\ tOr. l' t': .. Trivc ud ru m and Annuumln inagar ('ompart',1 to the rangt' at AlilJl!g,
(II) For a ll t he observatories t ill' rangt·s in'" ( II ) :lI HI S'I (Z) urc maximum Iluring- t lu-, . 1cquiuoct ial months hut 1he ra ng4' III 8'1 ( J)i:-: maximum (luring the su mmer months.
(c) Th4' l~h:l.n~l · in mngf' for nil t he elemonts from t hc cquinoct ial mont hs to
:-:U1H III4' r months is upprcoiable for Trivandrum a nr] .\ nnama la inaga r hUI, not so fur lilt'llorthernlllO~t olls('n ·:l.tory, AJiJ);\,!!,
(d ) S , (II ) ' "nriation,,'t a ll the three ,,11,,·,.·\'atori..s are pral'ti( 'ally in plaa,,"I' in all Iht·rhr4'4' s(' :l:o;on ~ . the maxima OC'currinf! withina f(·w lIlinutes of e.\ch otht'l', There i ~ a. clt'a rtentlellcv for maximum S q (Il ) to occur rarli erh\ a h01;t a n hour in the equinoctial month.....,~ i.lt'e i ally at Trh-aIHlrlllll allll Allna ma la i·lIag-a r.
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